Section IV. OPERATOR'S MAINTENANCE - TM-10-4320-202-150038

TM 10-4320-202-15

Section IV. OPERATOR'S MAINTENANCE

b. Loosen bail nut and release bail.

3 - 8 . General

c. Remove bowl, gasket, and screen. Empty

The instructions in this section are published

contents of bowl.

for the information and guidance of the oper-

d. Clean bowl with approved cleaning sol-

ator to maintain the pumping assembly.

vent; wipe dry.

e. Replace screen, gasket and bowl, secure

3-9. Fuel Strainer Service

in place with bail, and tighten bail nut.

f. Open shutoff valve.

a. Close shutoff valve.

Section V. TROUBLESHOOTING

Possible remedy

Probable cause

3 - 1 0 . General

Report to direct support

Engine cylinder scored

maintenance.

or piston stuck.

This section provides information useful in

Repair or replace cable

Spark plug cable defec-

diagnosing and correcting unsatisfactory oper-

(para 3-32).

tive.

ation or failure of the pumping assembly and

Spark plug wet or dirty _-- Clean and regap spark

it's components. Each trouble symptom stated

plug (para 3-32).

is followed by a list of probable causes of the

Replace breaker points

Magneto breaker points

trouble. The possible remedy recommended is

(para 3-31).

pitted or fused.

described opposite the probable causes of the

Replace magneto capacitor

Magneto capacitor de-

trouble. The possible remedy recommended is

(para 3-31).

fective.

maintenance shall be reported to direct support

maintenance.

3-13. Engine Misses or Runs Erratically

Possible remedy

Probable

cause

3-11. Engine Hard to Start or Fails to Start

Clean, regap or replace

Spark plug dirty or im-

spark plug (para 332).

properly gapped.

Possile

remedy

Probable cause

Fuel tank empty_ _ _ _ _ Fill fuel tank.

Replace spark plug cable

Worn, loose or leaking

Open valve (para 2-12).

Fuel shutoff valve

(para 3-32).

spark plug cable.

closed.

Magneto breaker points

Adjust or replace breaker

Fuel line obstructed_ _ _ _ _ _Clean fuel line.

defective or improperly

points (pare 3-31).

Spark plug defective_ _ _ _ _ _Relace spark plug (para

adjusted.

3-32).

Replace capacitor (para

Magneto capacitor defec-

Service air cleaner (para

Air cleaner dirty or too

331) .

tive.

3--4).

full of oil.

Drain and clean fuel tank

Contaminated _ _ _ _

Retime or replace magneto

Magneto improperly

and strainer (para 3-27).

(para 3-31).

timed or defective.

Refill tank with clean

Fuel mixture improper _ _ _ _ Adjust carburetor (para

fuel.

3-28).

Replace cable (para 3-32).

Spark plug cable defec-

Adjust and tighten con-

Governor controls loose

tive.

trols.

or improperly ad-

justed.

3-12. Engine Stops Suddenly

Replace gasket and tighten

Cylinder head loose or

cy]inder head bo1td.

has faulty gasket.

Possible remedy

Probable Cause

Fuel tank empty_ _ _ _ _ _ _Fill fuel tank.

Fuel line obstructed_ _ _ _ _ _ Clean or replace fuel line.

3-14. Engine Fails to stop

Contaminated fuel _ _ _ _ _ _ Drain, clean and refill fuel

Possible remedy

Probable cause

tank with clean fuel.

Ignition switch defective _ _ Report to direct support

Cool engine and restart.

Excessive engine heat

maintenance.

Provide adequate venti-

causes vapor lock.

lation around engine.

Remove, clean and re-

Hot spot in combustion

place cylinder head

chamber.

Remove obstruction from

Air vent hole in fuel

(para 3-41).

cap hole,

tank cap clogged.

3-8